Add dockerfile and CI to build it

.drone.yml

@@ -0,0 +1,21 @@
+---
+kind: pipeline
+name: build
+
+steps:
+- name: build image
+  image: plugins/docker
+  settings:
+    repo: kleph/pytubedl
+    tags: 
+      - ${DRONE_COMMIT_SHA:0:8}
+      - latest
+    username:
+      from_secret: dockerhub_username
+    password:
+      from_secret: dockerhub_password
+  when:
+    event:
+      exclude:
+      - pull_request
+

Dockerfile

@@ -0,0 +1,9 @@
+FROM python:slim
+  
+RUN pip install flask
+COPY /pytubedl/pytubedl.py /pytubedl.py
+COPY /pytubedl/templates /templates
+EXPOSE 5000
+
+CMD ["python", "pytubedl.py"]
+